https://scholars.lib.ntu.edu.tw/handle/123456789/86166
標題: | 行政院國家科學委員會專題研究計畫成果報告:土壤未飽和層水份與鹽份遲滯作用之研究(III) | 作者: | 譚義績 | 關鍵字: | 遲滯現象;保水曲線;鹽化土壤;Hysteresis;Soil-water retention curve;Salt effected soil | 公開日期: | 2003 | 出版社: | 臺北市:國立臺灣大學生物環境系統工程學系暨研究所 | 摘要: | 在未飽和土壤水分的傳輸現象中, 水分移動的水力特性是相當重要的,此 特性取決於土壤含水量及土壤類型等因 素,未飽和土壤水分會因乾燥、濕潤交 替的歷程而發生遲滯現象,要能準確的 計算則必須在乾燥、濕潤歷程交替變化 的環境中考慮遲滯現象的發生及其變 動。台灣地區四週環海,海水倒灌之情 形相當嚴重,此現象困擾著沿海地區之 土地利用、土壤復育及農業發展,因為 海水中的鹽份在隨水份進入土壤後,其 入滲、蒸發及運移之過程十分複雜,且 受遲滯現象之影響甚巨,也因此更顯未 飽和層中水流及鹽份傳輸研究之重要 性。 本研究計畫欲探討海水倒灌後土壤 中水份及鹽份的遲滯現象,規劃由未飽 和土壤之水份及鹽份的遲滯行為著手, 根據其物理及化學性質之變化進行理論 的分析及推演,並輔以砂箱試驗方式進 一步了解其機制,並期能建立其數值模 式,而能剖析未飽和土壤水份及鹽份傳 輸之奧秘。 In order to solve the transport of water in the unsaturated soil, the hydraulic properties must be available, the properties are dependent on the moistures and nature of soils. In unsaturated soils, hysteresis is an important phenomenon affecting water flow, and the effect should be taken into account during wetting and drying processes. Taiwan is surrounded with seawater , and it's very serious that seawater infiltrates into soil. The salinization of soil not only affects the usage of area along the coast, but also influences the restoration of soil and development of agriculture. Because after the salinity and water infiltrates into soil, the progress of infiltrating, evaporating, and transportation become very complex. In addition, hysteresis also has a great influence. Therefore, it becomes more important for unsaturated flow and the research of salinity transport. Hysteresis has important effects in the field and can not be neglected. Hysteresis is ignored in most studies because of it’s complication. The prediction of soil water balance can be improved by taking hysteresis into account under diurnally varying environmental condition that involved alternative wetting and drying processes. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/10751 | 其他識別: | 912313B002342 | Rights: | 國立臺灣大學生物環境系統工程學系暨研究所 |
顯示於: | 生物環境系統工程學系 |
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912313B002342.pdf | 642.68 kB | Adobe PDF | 檢視/開啟 |
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